【精品】机械专业英语论文

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1、Theoriginal126kVVacuumCircuitBreakerDebutedinChinaJimeiWang(DepartmentofEIectricaIEngineering,Xi1anJiaotongUniversityXi1an710049,ShaanxiProvinee,P.R.China)Abstract-Asinglebreak126kVvacuumcircuitbreakerdebutedinChinaisintroduced.Configurationof126kVvacuumcircuitbreakerandconfigura

2、tionofitseIectrodeareiIIustrated.Particularly,siIiconeoiIisusedasexternalinsuIationofvacuuminterrupters.Heatradiatorsaredesignedforraisingratedcurrent.PermanentmagnetactuatorswithIongstrokearedeveIopedforimprovingperformsneeofthevacuumcircuitbreaker・I.INTRODUCTIONAprojectofresear

3、chinganddeveloping126kVsinglebreakvacuumcircuitbreakerisbeingdonebycooperationofX「anJiaotongUniversity,vacuuminterruptermanufacturersandvacuumswitchgearfactoriesinChinaIttooknearlysixteenmonthstofinishaprototype.ItsmaintechnicalobjectivesareshowninTable1・TABLE1Maintechnicalobject

4、ivesof126kVvacuumcircuitbreaker.No.TechnicalparametersVallieUnit1Ratedvoltage126kV.nns2Ratedfrequency50Hz3Nominalratedcurrent2000A,nns4Ratedshortcircuitbreakingcurrent40kA,nns■DCcomponentofasymmetricalbreakingcurrentS32%6Ratedshortcircuitmakingcurrent100kA.peak7Ratedshorttimewith

5、standcurrent(4seconds)40kA.nns8Powerfrequencywithstandvoltage()minute)230kV,mis9Impulsewithstandvoltage(1.2X50rs)55()kV、peak10Permissibletemperatureofterminal-40

6、imumcontacterosion2mmII.CONFIGURATIONOF126kVVACUUMCIRCUITBREAKERThe126kVsinglebreakvacuumcircuitbreakerprototypeisshowninFig.1,whichshowsthreevacuuminterruptersareindividuallyassembledineachporcelainbushing1.Porcelaininsulatingsupport2ismountedonahorizontalsteelbracket3，andthreep

7、ermanentmagnetactuators4areseparatelyinstalledattheendofeachinsulatingporcelaininsulatingsupport2,whichareelectronicallycontrolledbycontrolbox5,thussynchronizationswitchingcouldberealized.Twosteelvacuuminterrupterthatisassembledinporcelainbushing?2-porcelaininsulationsupporters,3

8、-horizontalsteelbracket,4-permanentmagne